Police are to spy on well known trouble-makers as they launch a new operation aimed at cracking down on drunken louts in town centres.

In a new move, police in Shipley, Bingley, Ilkley and Keighley will visit people before they go out and warn them CCTV operators will be watching out for them.

The full version of this story is in this evening's Telegraph & Argus, and will appear on the website later tonight.